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Ratios between SARS-CoV-2 neutralizing antibody titers and (A, C, D) RBD IgGAM, S1 IgA, IWV in sample/calibrator ratios and (B) S1 quant IgG in BAU/ml. Sera of vaccinees two weeks after second vaccination (P1) were compared with sera of COVID-19 patients with mild and severe courses according to WHO score (2–3 mild and 4–5 severe). * = p<0.05, ** = p<0.01, *** = p<0.001, **** = p<0.0001, ns = not significant.
